The expression language defines a set of implicit objects in JSF context:

Variable	Description
facesContext	The FacesContext instance for the current request.
param	Maps a request parameter name to a single value.
paramValues	Maps a request parameter name to an array of values.
header	Maps a request header name to a single value.
headerValues	Maps a request header name to an array of values.
cookie	Maps a cookie name to a single cookie.
initParam	Maps a context initialization parameter name to a single value.
requestScope	Maps request-scoped variable names to their values.
sessionScope	Maps session-scoped variable names to their values.
applicationScope	Maps application-scoped variable names to their values.

The variable pageScope, which exists in JSP EL, does not exist in JSF EL.